Operating mechanism of circuit breaker

Abstract

An operating mechanism of a circuit breaker comprises a side plate, a trip lever, a lock catch lever, an upper connecting rod, a lower connecting rod, a handle lever, a main spring and a rotating shaft, the upper connecting rod is hinged to the trip lever, the upper connecting rod is pivoted to the lower connecting rod, one end of the main spring is hung on the handle lever, the other end of the main spring is hung on a connecting shaft, and the rotating shaft is pivoted to the lower connecting rod. The mechanism is characterized in that the handle lever is provided with a matching part matched with the jump buckle lever, the matching part comprises a first matching surface and a second matching surface which are arranged at an included angle, when the mechanism is buckled again, the handle lever drives the jump buckle lever to rotate so as to enable the jump buckle lever to be in contact and locked with the lock catch lever, and when the first matching surface is in contact with the jump buckle lever, the jump buckle lever is locked. And when the second matching surface is in contact with the tripping lever, the main spring applies a total moment to the handle lever to enable the handle lever to be far away from the re-tripping position, and when the second matching surface is in contact with the tripping lever, the main spring applies a total moment to the handle lever to enable the handle lever to be close to the re-tripping position. The self-locking mechanism has the advantages that the self-locking function of the operating mechanism in the re-buckling process is completed, the structure is simple, parts are reduced, and cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and in particular relates to an operating mechanism of a circuit breaker. Background Art

[0002] The low-voltage circuit breaker is installed in the circuit. The circuit breaker operating mechanism drives the contact separation / closure through the opening and closing operation to disconnect / connect the circuit. When a fault current appears in the circuit, the circuit breaker uses its own tripping component to trip the circuit breaker operating mechanism, driving the contact separation, and finally stabilizes in the tripping position to protect the circuit. When the circuit returns to normal, the circuit breaker needs to be re-tripped to make the circuit breaker operating mechanism reach the re-tripping state, and then the circuit breaker can be opened and closed by the operating mechanism. The re-tripping process of the existing circuit breaker operating mechanism is to push the handle lever, and the handle lever pushes the tripping button from the tripping position to the re-tripping position. During the whole process, the main spring is always in a stretched state, that is, a force must be applied to the handle lever in the direction of the re-tripping position to complete the re-tripping operation process. The above operation can be completed by manpower or by an electric operating mechanism.

[0003] Since the travel from the opening position to the re-closing position is small, it is easy for the circuit breaker to not be re-closed in place and cause re-closing failure, so there is room for improvement.

[0004] In view of the above-mentioned prior art, it is necessary to reasonably improve the handle lever and the jump button structure of the existing operating mechanism. For this reason, the applicant has made a useful design, and the technical solution to be introduced below is produced under this background. Utility Model Content

[0005] The utility model aims to provide an operating mechanism of a circuit breaker, wherein a contact surface cooperating with a trip lever is arranged on a handle lever, so as to complete the self-locking function of the operating mechanism during the re-tripping process, and the structure is simple, parts are reduced, and costs are saved.

[0006] The task of the utility model is accomplished in this way: an operating mechanism of a circuit breaker comprises a side plate, a trip lever, a lock lever, an upper connecting rod, a lower connecting rod, a handle lever, a main spring and a rotating shaft, wherein the trip lever, the lock lever and the handle lever are rotatably arranged on the side plate, the upper connecting rod is hinged with the trip lever through a hinge shaft, the upper connecting rod and the lower connecting rod are pivotally connected through a connecting shaft, one end of the main spring is hung on the handle lever, and the other end is hung on the connecting shaft, the rotating shaft is pivotally connected with the lower connecting rod, and the rotation is realized through the movement of the lower connecting rod , characterized in that: a matching portion that matches the trip lever is provided on the handle lever, and the matching portion includes a first matching surface and a second matching surface set at an angle. When the mechanism is re-locked, the handle lever drives the trip lever to rotate so that it contacts and locks with the lock lever. When the first matching surface contacts the trip lever, the main spring applies a total torque to the handle lever that makes the handle lever move away from the re-lock position. When the second matching surface contacts the trip lever, the main spring applies a total torque to the handle lever that makes the handle lever approach the re-lock position.

[0007] In a specific embodiment of the present invention, the angle between the first mating surface and the second mating surface is between 120° and 150°.

[0008] In another specific embodiment of the present invention, the angle between the first mating surface and the second mating surface is 135°.

[0009] In another specific embodiment of the present utility model, the mating portion includes a base and a first extension section extending downward along the base, the first mating surface is arranged on the inner side of the first extension section, the second mating surface is arranged at the end of the first extension section and is located below the first mating surface, and the first mating surface is connected with the second mating surface.

[0010] In another specific embodiment of the present invention, the mating portion also includes a second extension section, which is located below the first extension section and extends toward the outside of the handle lever, the first mating surface is located on the inner side of the first extension section, and the second mating surface is located on the second extension section.

[0011] The utility model has the beneficial effects of adopting the above structure: a first matching surface and a second matching surface which match the tripping lever and are set at an angle are arranged on the handle lever, and the connection point between the two is the inflection point. When the first matching surface of the handle lever moves on the tripping lever toward the inflection point, it is necessary to apply a torque on the handle lever to make the handle lever close to the re-decoupling position, and the main spring of the operating mechanism is stretched to store energy; when the second matching surface of the handle lever moves on the tripping lever away from the inflection point, it is not necessary to apply a torque on the handle lever to make the handle lever close to the re-decoupling position, and the handle lever can also move in the direction close to the re-decoupling position under the action of the spring force of the main spring, and the main spring is shortened to release energy. The energy required for the movement in this process is provided by the main spring, so that the self-locking function is realized. At the same time, the structure is simple, parts are reduced, the space occupied is small, and the cost is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the contact position between the first matching surface of the handle lever and the tripping lever when the operating mechanism of the utility model is buckled again;

[0013] Figure 2 It is a schematic diagram of the contact position between the second matching surface of the handle lever and the tripping lever when the operating mechanism of the utility model is buckled again;

[0014] Figure 3 It is a schematic diagram of the operating mechanism of the utility model being in a tripping position;

[0015] Figure 4 It is a schematic diagram of the moment when the first matching surface of the handle lever of the utility model contacts the trip lever;

[0016] Figure 5 It is a schematic diagram of the moment when the second matching surface of the handle lever of the utility model contacts the trip lever;

[0017] Figure 6 It is a schematic diagram of the change of the main spring torque on the tripping lever during the re-fastening process of the utility model;

[0018] Figure 7 This is a structural schematic diagram of an embodiment of the handle lever of the utility model;

[0019] Figure 8 It is a structural schematic diagram of another embodiment of the handle lever of the utility model.

[0020] In the figure: 1. side plate; 2. trip lever, 21. contact part; 3. upper connecting rod; 4. handle lever, 41. matching part, 411. base, 412. first extension section, 4121. first matching surface, 4122. second matching surface, 413. second extension section, 5. main spring; 6. locking lever; 7. lower connecting rod; 8. moving contact; 9. rotating shaft; 10. connecting shaft; 20. static contact; 30. hinge shaft. DETAILED DESCRIPTION

[0021] The following is a detailed description in the form of embodiments, but the description of the embodiments is not a limitation of the present invention. Any equivalent changes made based on the concept of the present invention that are merely formal but not substantial should be regarded as within the scope of the technical solution of the present invention.

[0022] In the following description, all concepts related to directionality or orientation such as up, down, left, right, front and back refer to the position states of the corresponding drawings, and therefore cannot be understood as special limitations on the technical solutions provided by the present utility model.

[0023] Example 1

[0024] See also Figure 1 The utility model relates to an operating mechanism of a circuit breaker, comprising a side plate 1, a tripping lever 2, a locking lever 6, an upper connecting rod 3, a lower connecting rod 7, a handle lever 4, a main spring 5, a moving contact 8 and a rotating shaft 9. The tripping lever 2, the locking lever 6 and the handle lever 4 are rotatably arranged on the side plate 1. The upper connecting rod 3 is hinged to the tripping lever 2 through a hinge shaft 30. The handle lever 4 drives the tripping lever 2 to rotate so that it contacts and locks with the locking lever 6; the upper connecting rod 3 and the lower connecting rod 7 are pivotally connected through a connecting shaft 10; one end of the main spring 5 is hung on the handle lever 4, and the other end is hung on the connecting shaft 10; the rotating shaft 9 is pivotally connected to the lower connecting rod 7, and is rotationally contacted and separated from the static contact 20 through the movement of the lower connecting rod 7, so as to realize the connection and disconnection of the circuit breaker.

[0025] like Figure 7As shown, the handle lever 4 is provided with a matching portion 41 for matching with the tripping lever 2, and the matching portion 41 includes a first matching surface 4121 and a second matching surface 4122, the first matching surface 4121 and the second matching surface 4122 match with the tripping lever 2, and the first matching surface 4121 and the second matching surface 4122 are arranged at an angle. The angle between the first matching surface 4121 and the second matching surface 4122 is between 120° and 150°, preferably 135°. The matching portion 41 includes a base 411 and a first extension section 412 extending downward from the base 411, the first matching surface 4121 is arranged on the inner side of the first extension section 412, the second matching surface 4122 is arranged at the end of the first extension section 412 and is located below the first matching surface 4121, the first matching surface 4121 is connected with the second matching surface 4122, and the connection point between the two is the inflection point.

[0026] The circuit breaker generally includes a closing position, a tripping position, an opening position and a re-tripping position, which are used to indicate the on and off status of the circuit breaker. During the operation of the operating mechanism from the tripping position to the re-tripping position, the handle lever 4 pushes the tripping lever 2 from the tripping position to the re-tripping position. During the entire re-tripping operation process, the handle lever 4 and the tripping lever 2 are composed of two moving parts. In the first movement process, the main spring 5 of the operating mechanism applies a total torque to the handle lever 4 to make the handle lever 4 away from the re-tripping position, and the main spring 5 stretches to store energy. In the second operation process, the main spring 5 of the operating mechanism applies a total torque to the handle lever 4 to make the handle lever 4 close to the re-tripping position, and the main spring 5 contracts to release energy. Specifically, during the re-tripping process, the contact surface between the handle lever 4 and the tripping lever 2 is composed of a first mating surface 4121 and a second mating surface 4122 having an inflection point feature. When the first mating surface 4121 of the handle lever 4 moves on the tripping lever 2 toward the inflection point, the main spring 5 of the operating mechanism applies a total torque to the handle lever 4 that moves the handle lever 4 away from the re-decoupling position, and the main spring 5 stretches to store energy; when the second mating surface 4122 of the handle lever 4 moves on the tripping lever 2 away from the inflection point, the main spring 5 of the operating mechanism applies a total torque to the handle lever 4 that moves the handle lever 4 close to the re-decoupling position, and the main spring 5 contracts to release energy.

[0027] Please refer to Figure 1 , Figure 3 Combined with Figure 4 , Figure 6 The circuit breaker is re-tripped from the tripped position, and the handle lever 4 is pushed to rotate clockwise. The handle lever 4 pushes the trip lever 2 to rotate clockwise. At this time, the first mating surface 4121 of the handle lever 4 slides on the contact portion 21 on the trip lever 2. Figure 1As shown, the trip lever 2 is subjected to a force F2 by the main spring 5 through the upper connecting rod 3, and a force F1 is applied to the handle lever 4 to rotate the handle lever 4 counterclockwise. At the same time, the main spring 5 applies a force Ft to the handle lever 4 to rotate the handle lever 4 clockwise. The total torque Mt of the main spring 5 on the handle lever 4 is equal to F1*L2-Ft*L1. When the first mating surface 4121 of the handle lever 4 moves on the contact portion 21 of the trip lever 2, F1*L2>Ft*L1, so it is necessary to apply a clockwise torque M to the handle lever 4, so that Ft*L1+M>F1*L2, and the handle lever 4 can rotate clockwise. In this process, the torque M does work and is absorbed by the main spring 5, and the main spring 5 stretches and stores energy. When the first mating surface 4121 of the handle lever 4 moves on the contact portion 21 of the trip lever 2, this force-torque relationship is basically maintained.

[0028] Please refer to Figure 2 Combined with Figure 5 , Figure 6 When the tripping lever 2 enters the inflection point area between the first mating surface 4121 and the second mating surface 4122 of the handle lever 4, the direction of F1 changes and moves toward the rotation point of the handle lever 4, L2 decreases sharply, and the main spring 5 applies a counterclockwise force F1 to the handle lever 4 through the tripping lever 2, satisfying F2*L4=F1*L3. As for the tripping lever 2, the sizes of L3 and L4 are basically unchanged, so F1 is basically unchanged, so that when the second mating surface 4122 of the handle lever 4 moves on the tripping lever 2, F1*L2﹤Ft*L1, at this time, there is no need to apply a clockwise torque M on the handle lever 4, and the handle lever 4 can also move clockwise under the action of the spring force of the main spring 5 until the handle lever 4 is limited. The energy required for movement in this process is provided by the main spring 5, the main spring 5 shortens, releases energy, and the tripping lever 2 remains in the bottom position. The tripping lever 2 is separated from the locking lever 6, and the circuit breaker operating mechanism stays in the re-tripping position.

[0029] Example 2

[0030] See also Figure 8 The difference between this embodiment and embodiment 1 is that the structure of the handle lever 4 is changed. Specifically, the matching portion 41 also includes a second extension section 413, and the second extension section 413 is located below the first extension section 412 and extends to the outside of the handle lever 4. The first matching surface 4121 is located on the inner side of the first extension section 412, and the second matching surface 4122 is located on the second extension section 413. In this embodiment, the working principle of the operating mechanism is the same as that of embodiment 1, which will not be repeated here.

Claims

1. An operating mechanism of a circuit breaker, comprising a side plate (1), a trip lever (2), a lock lever (6), an upper connecting rod (3), a lower connecting rod (7), a handle lever (4), a main spring (5) and a rotating shaft (9), wherein the trip lever (2), the lock lever (6) and the handle lever (4) are rotatably arranged on the side plate (1), the upper connecting rod (3) and the trip lever (2) are hingedly connected through a hinge shaft (30), the upper connecting rod (3) and the lower connecting rod (7) are pivotally connected through a connecting shaft (10), one end of the main spring (5) is hung on the handle lever (4), and the other end is hung on the connecting shaft (10), the rotating shaft (9) is pivotally connected to the lower connecting rod (7), and is rotated by the movement of the lower connecting rod (7), characterized in that: The handle lever (4) is provided with a matching portion (41) for matching with the trip lever (2), and the matching portion (41) includes a first matching surface (4121) and a second matching surface (4122) arranged at an angle. When the mechanism is re-locked, the handle lever (4) drives the trip lever (2) to rotate so that it contacts and locks with the lock lever (6). When the first matching surface (4121) contacts the trip lever (2), the main spring (5) applies a total torque to the handle lever (4) to move the handle lever (4) away from the re-locking position. When the second matching surface (4122) contacts the trip lever (2), the main spring (5) applies a total torque to the handle lever (4) to move the handle lever (4) close to the re-locking position.

2. The operating mechanism of a circuit breaker according to claim 1, characterized in that: The included angle between the first mating surface (4121) and the second mating surface (4122) is between 120° and 150°.

3. The operating mechanism of a circuit breaker according to claim 2, characterized in that: The angle between the first mating surface (4121) and the second mating surface (4122) is 135°.

4. The operating mechanism of a circuit breaker according to claim 1, characterized in that: The mating portion (41) comprises a base (411) and a first extension section (412) extending downwardly along the base (411); the first mating surface (4121) is arranged on the inner side of the first extension section (412); the second mating surface (4122) is arranged at the end of the first extension section (412) and is located below the first mating surface (4121); the first mating surface (4121) is connected to the second mating surface (4122).

5. The operating mechanism of a circuit breaker according to claim 1, characterized in that: The mating portion (41) further comprises a second extension section (413), wherein the second extension section (413) is located below the first extension section (412) and extends toward the outside of the handle lever (4), the first mating surface (4121) is located on the inner side of the first extension section (412), and the second mating surface (4122) is located on the second extension section (413).

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